Abstract
In this paper, a microparticle system consisting of cationic polyacrylamide (CPAM) and anionic spherical polyelectrolyte brushes (ASPB) is proposed to improve the retention of pulp suspension containing bleached reed kraft pulp and precipitated calcium carbonate (PCC). We first describe the preparation of ASPB. The ASPB, consisting of a carbon sphere (CS) core and a shell of sodium polystyrene sulfonate (PSSNa) brushes, was synthesized by surface-initiated polymerization. The structure and morphology of ASPB were characterized by Fourier-transform infrared spectrometry (FTIR), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Then, flocculation and retention of pulp suspension by a CPAM/ASPB dual-component system were examined. Our results indicate that more highly effective flocculation and higher retention efficiency could be achieved simultaneously by a CPAM/ASPB dual-component system when compared to the conventional microparticle system. Bridging flocculation and electrostatic attraction might be the main flocculation mechanism for CPAM/ASPB systems.
Highlights
Process efficiency and paper quality strongly depend on the chemical flocculation of the pulp during papermaking
A variety of chemical additives, known as retention systems, including single-polymer systems, dual-polymer systems and microparticle systems have been developed to achieve a significant improvement in the quality of the final product and the runnability of the papermaking machine [1,2,3,4,5,6]
Paper, we we develop develop aa new new kind kind of of microparticle microparticle retention retention aid, aid, namely namely anionic anionic spherical spherical polyelectrolyte brushes (ASPB), which consist of a carbon sphere (CS)
Summary
Process efficiency and paper quality strongly depend on the chemical flocculation of the pulp during papermaking. A variety of chemical additives, known as retention systems, including single-polymer systems, dual-polymer systems and microparticle systems have been developed to achieve a significant improvement in the quality of the final product and the runnability of the papermaking machine [1,2,3,4,5,6]. Microparticle systems tend to show better performance in retention, drainage and paper quality [2,4]. A typical microparticle system usually consists of high molecular weight polymers and microparticles with opposite charges In this system, bentonite, montmorillonite and colloidal silica are commonly used microparticles [4,5,7,8]. Much attention has been paid to research on the improvement of wet-end efficiency by structure optimization of additives
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